ng-bay or salmon pool. One glance at a bit of the weed, as it floats past, showed that it is like no Fucus of our shores, or anything we ever saw before. The difference of look is undefinable in words, but clear enough. One sees in a moment that the Sargassos, of which there are several species on Tropical shores, are a genus of themselves and by themselves; and a certain awe may, if the beholder be at once scientific and poetical, come over him at the first sight of this famous and unique variety thereof, which has lost ages since the habit of growing on rock or sea-bottom, but propagates itself for ever floating; and feeds among its branches a whole family of fish, crabs, cuttlefish, zoophytes, mollusks, which, like the plant which shelters them, are found nowhere else in the world. And that awe, springing from 'the scientific use of the imagination,' would be increased if he recollected the theory--not altogether impossible--that this sargasso (and possibly some of the animals which cling to it) marks the